Precision Twist Drill 5999989 29-Piece HSS Jobber Length Drill Bit Set 1/16"-1/2"

The Precision Twist Drill 5999989 is a 29-piece R51 Series High-Speed Steel (HSS) Jobber Length Drill Bit Set, covering fractional sizes from 1/16" to 1/2" by 64ths. Engineered for general-purpose drilling in a wide range of materials including mild steel, aluminum, wood, plastics, and composites, this set is a trusted choice for machinists, maintenance professionals, and serious DIYers alike.

Built to the R51 standard, each bit features a 118° conventional point angle for easy centering and versatile material compatibility. The high-speed steel construction provides excellent hardness and heat resistance, maintaining a sharp cutting edge through demanding drilling applications. All bits include a bright finish (uncoated) for easy visual inspection of wear.

Key Features:

• 29-piece fractional set: 1/16" to 1/2" by 64ths
• R51 Series High-Speed Steel (HSS) construction
• 118° conventional split or standard point for accurate starting
• Jobber length — the most common and versatile drill bit length
• Bright (uncoated) finish for easy wear inspection
• Right-hand cut, standard flute geometry
• Suitable for steel, aluminum, wood, plastic, and most general-purpose materials
• Manufactured in the USA by Precision Twist Drill
• Comes in a durable index case for organized storage and easy bit selection

Precision Twist Drill has been a leading American manufacturer of cutting tools since 1885, and the 5999989 set reflects their commitment to consistent quality and tight tolerances. Whether used on a drill press or handheld power drill, this set delivers reliable, repeatable performance across a broad range of shop and field applications.